Currently I have the Magnaflow Street Series 16887 Catback. I didn't like the drone and volume of the mufflers that came with the catback so I switched them out for Dynomax Super Turbo mufflers. Things definitely improved but I still get a drone and vibration inside the cabin at low RPMs between 1000-1500 when cruising in higher gears. I still have stock manifolds and cats currently.

I was thinking of replacing the small mid muffler on the catback with the larger Magnaflow 12468 Tru-X muffler that was introduced by Pat G.

From what I've been reading on the forum if you already have a exhaust system and just want to reduce the drone then order some J pipes and have them installed on your current set up. I have magnaflows right now but I will be changing mine veerrrrryyyyy soon.

From what I've been reading on the forum if you already have a exhaust system and just want to reduce the drone then order some J pipes and have them installed on your current set up. I have magnaflows right now but I will be changing mine veerrrrryyyyy soon.

I'm looking to reduce volume a bit and drone. J-Pipes only get rid of drone.

I've decided to go with the Magnaflow 12468 to replace the current mid muffler. After doing more research it seems to be the one that will quiet things down a bit and also eliminate some drone. Looks like having two x-pipes in the exhaust system should be no issue performance wise.

Thanks Silvereagle,
Exactly what I was looking for, would like to get a system this spring that sounds a bit more aggressive at idle. Stock system sounds like a Cobalt until you jump on it. How bad is that freeway drone everybody is always talking about ?

Not noticeable for me personally, but my wife complained about "too much engine noise" when driving up mountain passes in the 1800 rpm range in lowest gear. Otherwise daily driving to work, the sounds is lovely. I love my Magnaflow, the X-pipe config with the mid resonator gives it the slight exotic sound I like instead of the American V8 cam lope sound that some prefer (I think it sounds like an untuned engine with little refinement IMHO)

Had the Magnaflow 12468 installed and it greatly reduced my drone at 1500 rpm and below in higher gears. I'm really glad I finally got this done.

Now that I look back, I pretty much wasted money on the Magnaflow catback as I've now replaced the mufflers and the mid resonator. If I had to do it again I should have kept the stock catback and just replaced the mufflers, the mid resonator, and put in an x-pipe. Would have been way cheaper.

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